[Brad F.]

The thing that sent off alarms in my head was his check on the flop. He showed strength pre-flop and then he just slows down on the flop?

I think your check/call on the turn is a fine idea, although it's a tough spot and I'd feel the urge to get my chips in as well. Villian in my opinion probably has QQ, AQ, or another AK. I'm kind of biased though as the sound of your post makes me feel that you lost. That 5k bet could just be a probe bet I guess.

I think he calls with AJ here possibly, but did he really reraise a UTG+1 preflop raise with AJ?

I just don't see how you are ahead here, unless he is playing KK post flop horribly. I could see him maybe play JJ this way, but he's not calling your push with JJ.

So overall, I think calling his bet on the flop is the best option and hope for a cheap showdown. You beat his JJ or KK, but otherwise, I think most of the time, you are beat here.

Brad